$2\sec=6$

$\frac{\left(1+sin\left(x\right)\right)\left(1-sin\left(x\right)\right)}{cos\left(x\right)}=cos\left(x\right)$

$\frac{3x}{x^2+x-2}$

$\frac{x+7}{4}=\frac{x+4}{7}$

$\int x\sqrt{8x-x^2}dx$

$\left(2x^2-3x-35\right)+\left(x-5\right)$

$\frac{8^9}{8^8}\cdot\frac{15^7}{15^2}$